Method and apparatus for making rip seals for packages



Jan. 31, 1939. H. SCHUN EMANN I METHOD AND APPARATUS FOR MAKING F UPSEALS FOR F 'ACKAGES Filed Jan. 9, 1936 2 Sheets-Sheet 1 I in emgmyz 1INIVENTOIRZ H. SCHUNEMANN Jan. 31, 1939.

METHOD -AND APPARATUS FOR MAKING RIP SEALS FOR PACKAGES 2 Sheets-Sheet2.

Filed Jan. 9, 1936 3 ms nu 'INVENTOR.

. Patented Jan. 31, 1939 METHOD AND APPARATUS'FOR MAKING RIP SEALS FORPA K GES Heinrich Schiinemanm. Berlin-Spandau,

Ger-

many,'assig nor, by mesne assignments, to Hans Neuerburg, Kiiln Zweigder H. F. and Ph. F. Reemstsma, Cologne, Germany, a-limited partnershipof Germany Application January 9,1938, Serial No. 58,364

In Germany April 20, 1935 .3 Claims. (01. 216-30) This invention relatesto a method and means for producing an air and moisture-proof rip sealfor packages, more particularly cigarette boxes. In order to producesuch a seal, it is known tounwind a strip from a reel, pass it by aglueing device so as to apply an adhesive to one side thereof and tocause the strip to adhere around the joints oi. the package.

The gist of the invention resides in the fact that after applying theglue,a narrower ripping strip or spaced ripping cords are arranged onthe adhesive side of the strip and that a ripping tongue is formed afterapplying the ripping strip to the l sealing strip. The layer of glue isalso covered on one end by a strip of paper and this part of the stripis provided with slots on both sides of the ripping strip ,or .rippingcords.

I The invention is illustrated by way of example in the accompanyingdrawings in which:

Figure 1 is' a front view of the closed airand moisture-proof rip sealfor a cigarette box or package.

Figure 2 is a similar view showing the start of the opening operation.

Figure 3 is an elevation and Figure 4 a plan view of a machine forcarrying out the method of providing the composite. strip.

Figure-5 is an enlarged view in elevation of the means for covering theglue layer at an end of the strip and ior'forming slots therein.

Figure 6 is a side view of the apparatus shown in Figure 5.

- Referring to Figures 1 and 2 it is to be noted that the seal is formedfrom a foil strip I-, on the adhesive side of which a narrower rippingstrip or end Ib of the strip I is partially covered by a nonglued stripor pieceof paper 3 so that the covered part cannot stick to the portionIn of the strip I..

Slots 4, are provided in the end lb adjacent the edges of the seal stripor in the vicinity-of the ripping cords and by means of these slots atongue is formed for ripping the" seal in a manner as machine frame. Thecords are held apart by a 45 shown in Fig. 2.

According to the invention, theworking method for producing the sealresides in the fact that the seal strip provided with the ripping stripor. the

, ripping cords is covered on the overlapping end the strip I is drawn.The seal strip I removed from the reel 6 is moved over a glue wheel I sothat an adhesive is applied to one side. The glueing apparatus comprisesa glue container 3 and a nozzle 9. The glue wheel I rotates with the pe-'5 riphery adjacent the. orifice of the nozzle 9. In order that the gluewill not be applied to the outer most edges of the strip I so as toprotrude laterally over the edges of the strip and soil the package, theedges of the strip I are covered by covering 10 members I0, Fig. 3,whereby narrow edges of the seal strip remain free oi glue. I

The glue-applying roller I I may be adjusted for the purpose ofregulating the thickness of the layer oi glue. 1 5

The glue container 8 may be swung about the shaft I8 of the glue wheel!as shown by dot-anddash Hues in Figure 3. 'The glue wheel I is alsomounted in bearing arms and adapted to swing on pivots I9'in order thatit may be moved into 20 I the position shown by dot-and-dash lines inFigure 3. This arrangement permits easy cleaning of the glue-applyingapparatus.

After the strip I has passed the glueing 'apparatus, it enters a dryingdevice 20, which has 25 the form of a vertical chamber., In this dryingchamber, rollers 2| are arranged, Figs. 3 and 4, which are driven fromthe main shaft of the ma,- chine.v From the lower rollers 2I, the sealstrip passes over an upper guide roller 22. The strip is so conducted inseveral loops through the chamber 20 'whereby rapid and eiiicient dryingis ensured. The drying process or the volatilization of the glue solventmay also be accelerated by arranging heating devices 23 in the dryingchamber 20. 35

It is to be noted that the strip I always passes over the guide rollerscrosswise so that the glued side is located externally. After passingout of the drying chamber 20, thestrip I passes over a tensioning orequalizing roller 24, carried by 40 rocking lever, to a roller 25.

The ripping cords 2 are then applied to the glued side of the strip.These cords are removed from reels 26 whichare rotatably mounted on theguide member 21 to the extent required for the ripping width and thecords are pressed onto the glue layer of the strip I by means of aweighted roller 28. I I

The stepwise advance of the strip I with these ripping cords embedded onglued side thereof, see Figure 4, is efiected'by pliers or grippingmeans 3i which are opened and closed periodically and reciprocate over adistance equal to a the length of one seal strip. The pliers 3| coopbox)has been cut off, the latch 30. presses the seal strip resilientlyagainst the guide 29'so as to prevent the strip I from sliding backunder the action of the swinging equalization roller 24.

When a severed piece of the strip I is to be laid around a package, thestrip I must be advanced,

stepwise while the guide rollers 2|, which move the. strip I from thereel 6 through the glueing apparatus and the drying device, rotatecontinually. The equalizing roller 24. swings up and down whereby theseal strip from the glueing apparatus to the guide 29 is kept undertension.

When the pliers 3| are moved in the direction of the arrow 39, theyengage, at the end of the stroke, the free end of the'strip I andadvance it to the extent of a new sealing length. Shortly before the endof the stroke, a paper strip 3,

- Figures 4, and 6, for covering the glue' layer r so of. the endof thestrip I is advanced-parallel to the strip I from a reel, 46 shown inFig. 3.

This movement of the paper strip 3 is effected by a driving pulley ,orroller 4I shown particularly in Fig. 5. An endless belt 43 passes aroundthe.

roller 4| and around a pulley 42 spaced therefrom. The roller 4I may forinstance be driven by means of a ratchet wheel 44 shown in Fig. 6 and apawl carried by a lever 45.

The strip 3 drawn from the reel 46 passes through a guide 41 which isrotatably mounted on a pivot 48. This guide normally occupies theposition shown-in full lines in Figure 5. Immediately before the pliers.3I close and a fresh seal strip section is advanced the guide 41 isswung into the position shownin dotted lines and the paper strip 31s fedforward. Thereupon'the shears 49 close which movement may be effected bya cam disk 50 shown in Fig. 3. ',The strip section to be placed on thepackage is thereby cut from the continuous strip I and the paper strip 3applied on the glued side of its end is'simultaneously out. As shown inFig. 5 a press member 5| is mounted on 'one'leg of the shears 49 which,during,the cutting operation presses the paper strip.

3 firmly against the glued face of the strip I.

A pair of cutters 51 are moved by a slide 56 towards the end of thestrip in the direction ofthe arrow-58, Figure 5. Before the pair ofcutters 51 touch the seal strip, a springeinfluenced roller 59 contactsthe piece of 'paper3. The cutters 51 then provide slots in the end ofthe severed strip I; The cutting operation takes place when.

the severed strip section lylnginfl the path of the packages 52 to besealed is moved along by the package 52, Figure 4, in the direction ofthe ar--' row 53.; The two slots 4, Figure 1, are thereby "-1. A methodof producing 3 and to facilitate the grippi of the overlapping end. Thetongue provided in the overlapping end is called the p". -When it isdesired to'open the package, a pull is exerted on the gripwhereby thestrip I is torn along the joint by the ripping cords 2. v

After the strip section for sealing a package has been severed from theroll, it is carried alongwith the package or box 52 in the direction ofthe arrow 53 whereupon the seal strip is arranged around the openingjoint of the box in a known manner.

I claim:

a rippable strip adapted for sealing packages which comprises, removingan air and moisture-proof strip from a roll thereof, applying anadhesive to one side of the moving strip, embedding a narrower rippingstrip inv the adhesive face of the moving strip, and covering a portionof the strip on the adhesive face with a strip of paper, cutting slotsalong both edges of the ripping strip and thereafter severing the stripadjacent the paper covered end.

2. In apparatus adapted to complete the formation of a package sealingstrip having a narrower ripping strip adhesively attached to one facethereof to provide a composite rippable sealing strip for a package,means for intermittently 'moving the composite strip, a reel adapted tohold a continuous paper strip wound thereon,

means for feeding forward said paper strip, a

cutting device arrangedin the path of movement of the composite strip,movable means for guid ing the paper strip from the reel to a positionadjacent the adhesive-coated face of the first mentioned strip andadjacent the: cutting device so as to cover a portion of the adhesivecoated face, means associated with said cutting device .for urging an'end'portion of the paper strip against the adhesive coated face of thecomposite strip, and said cutting device being adapted to sever thecompositestrip and the paper 'strip whereby the end portion of thecomposite strip is covered on the adhesive coated face by the severedportion of the paper strip.

3. Apparatus according to claim 2 characterized by the fact that a slidemember having a pair of cutters is moved simultaneously with the cuttingdevice towards the composite stripand slots are out in the end of-thestrip along both, sides of the ripping strip.

rmnmrcn scniinnrramr.

